code: def output_dim(self) -> int:
      raise NotImplementedError
  
file_path: espnet/espnet2/enh/encoder/abs_encoder.py
imports: from abc import ABC, abstractmethod
  from typing import Tuple
  import torch
label_desc: Use image node_id 2 for calling the AbsEncoder obj's underlying member method code with example usage: obj.output_dim() without return types